Recovery of Alkali from Bayer Red Mud Using CaO and/or MgO
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Experimental Methods
2.3. Analytical Methods
3. Results and Discussion
3.1. Characterization of Bayer Red Mud
3.2. Recovery of Na2O Using CaO/MgO
3.3. Phase Differences of CaO/MgO Substituting Na2O
3.4. Reaction Kinetics of Alkali Recovery
3.5. FTIR Spectra Analysis
3.6. Solid Morphology
4. Conclusions
Supplementary Materials
Author Contributions
Funding
Conflicts of Interest
References
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Chemicals | Al2O3 | SiO2 | CaO | Fe2O3 | Na2O | TiO2 | K2O | MgO | N/S |
---|---|---|---|---|---|---|---|---|---|
Content (wt. %) | 24.42 | 21.12 | 18.47 | 8.14 | 5.97 | 4.56 | 1.53 | 0.75 | 0.28 |
MgO% | Temperature/℃ | MgO | Mg(OH)2 | (Mg4.5Al1.5)(Si2.5Al1.5)O10(OH)8 |
---|---|---|---|---|
0 | 90 | x | x | x |
140 | x | x | x | |
190 | x | x | x | |
50 | 90 | √ | √ | x |
140 | √ | √ | x | |
190 | √ | √ | √ | |
100 | 90 | √ | √ | x |
140 | √ | √ | √ | |
190 | √ | √ | √ |
MgO% | Ca10Mg2Al4(SiO4)5(Si2O7)2(OH)4 | Mg3Si2O5(OH)4 | (Mg4.5Al1.5)(Si2.5Al1.5)O10(OH)8 |
---|---|---|---|
0 | x | x | x |
10 | √ | x | x |
30 | √ | √ | √ |
50 | √ | √ | √ |
70 | √ | √ | √ |
90 | √ | √ | √ |
100 | √ | √ | √ |
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Zhou, B.; Cao, S.; Chen, F.; Zhang, F.; Zhang, Y. Recovery of Alkali from Bayer Red Mud Using CaO and/or MgO. Minerals 2019, 9, 269. https://doi.org/10.3390/min9050269
Zhou B, Cao S, Chen F, Zhang F, Zhang Y. Recovery of Alkali from Bayer Red Mud Using CaO and/or MgO. Minerals. 2019; 9(5):269. https://doi.org/10.3390/min9050269
Chicago/Turabian StyleZhou, Bingxin, Shaotao Cao, Fangfang Chen, Fangfang Zhang, and Yi Zhang. 2019. "Recovery of Alkali from Bayer Red Mud Using CaO and/or MgO" Minerals 9, no. 5: 269. https://doi.org/10.3390/min9050269